The HSMM working group never proposed the use of spread spectrum. It was interested in getting the maximum data rate into limited bandwidths. SS does the opposite of what the HSMM WG was interested in. It spreads limited amounts of data over the maximum bandwidth.
The actual proposal was to create small segments in the 80, 40, 20 and 15 meter bands for emissions up to 16 kHz wide -- matching what existed in the 10 meter band but on a much smaller scale. Many of us wanted that limited to 9 kHz -- the same as the ARRL allowed for AM. The goal was to preserve the priveledges that currently exist in the phone/image segments (AM equivalent bandwidth) as the ARRL was shrinking bandwidths in the RTTY/data segments (currently unlimited bandwidth). 73, John KD6OZH ----- Original Message ----- From: KH6TY To: digitalradio@yahoogroups.com Sent: Saturday, March 06, 2010 14:01 UTC Subject: Re: [digitalradio] A question about spread spectrum The other possible problem is "wide-spreading" spread spectrum. There was a failed attempt about 5 years ago by the ARRL HSMM (High Speed Multi-Media) proponents to allow spread spectrum on the HF bands with the argument that the signal is spread so widely, each carrier appears at any given frequency only a short time, so it would not significantly interfere with other users of the frequency, and could, for example, be allowed to cover the entire 20m band.
